| (19) |
 |
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(11) |
EP 0 551 865 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
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11.08.1993 Bulletin 1993/32 |
| (43) |
Date of publication A2: |
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21.07.1993 Bulletin 1993/29 |
| (22) |
Date of filing: 12.01.1993 |
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| (84) |
Designated Contracting States: |
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DE FR GB IT NL |
| (30) |
Priority: |
13.01.1992 JP 3960/92
|
| (71) |
Applicant: MITSUI PETROCHEMICAL INDUSTRIES, LTD. |
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Tokyo 100 (JP) |
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| (72) |
Inventors: |
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- Tanaka, Masahide,
c/o MITSUI PETROCHEM. IND., LTD.
Kuga-gun,
Yamaguchi 740 (JP)
- Fujimoto, Tadaaki,
c/o MITSUI PETROCHEM. IND., LTD
Kuga-gun,
Yamaguchi 740 (JP)
- Takahata, Kazunori,
c/o MITSUI PETROCHEM. IND.,LTD
Kuga-gun,
Yamaguchi 740 (JP)
|
| (74) |
Representative: Hansen, Bernd, Dr. Dipl.-Chem. et al |
|
Hoffmann, Eitle & Partner
Patent- und Rechtsanwälte,
Postfach 81 04 20
81904 München
81904 München (DE) |
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| |
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| (54) |
Polycarbonate and use thereof |
(57) The polycarbonate of the invention is a polycarbonate derived from adducts such as
propylene oxide adducts of polyglycerols. The lubricating oil of the invention comprises
this polycarbonate, and if necessary, a specific polycarbonate having a -C₂H₄O- group
and/or a -CH₂CH(CH₃)O-group in its main chain. The lubricating oil of the invention
can be used as a lubricating oil for refrigerators such as automotive air-conditioner
and electric refrigerator. In particular, the lubricating oil of the invention is
suitable as a lubricating oil for refrigerator wherein high-viscosity lubricating
oil is used, for example, lubricating oil for automotive rotary air-conditioner, and
also suitable as lubricating oil for a refrigerator wherein ozone layer-nondestructive
hydrogenated fluorocarbon such as R-134a is used as a refrigerant.